id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
32971	Internal Field.check() methods don't need to construct and return lists	Chris Jerdonek	nobody	"I noticed that many of the internal ""check()"" methods used by `Field` subclasses return lists (including the empty list) when they can just yield items (or yield nothing). This is because the concrete `check()` implementations unpack the return value when constructing a new list. See here for one example of such a `check()` method: https://github.com/django/django/blob/f331eba6d576752dd79c4b37c41d981daa537fe6/django/db/models/fields/__init__.py#L196-L205

The proposed change, then, would be to change methods like the following to yield their items instead of creating and returning a list: https://github.com/django/django/blob/f331eba6d576752dd79c4b37c41d981daa537fe6/django/db/models/fields/__init__.py#L243-L254"	Cleanup/optimization	new	Database layer (models, ORM)	dev	Normal				Unreviewed	0	0	0	0	0	0